OS X TTS: add pitch setting.

The current TTS configuration doesn't allow querying the system values so it
currently can't be displayed. A value of 0 will use the system default. The
default pitch is dependent on the voice; most voices should have a default
pitch of 45 - 55.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29673 a1c6a512-1295-4272-9138-f99709370657

rbutil/rbutilqt/base/ttscarbon.h

@@ -33,7 +33,8 @@ class TTSCarbon : public TTSBase
     enum ConfigValuesCarbon
     {
         ConfigVoice,
-        ConfigSpeed
+        ConfigSpeed,
+        ConfigPitch
     };
     public:
         TTSCarbon(QObject *parent = NULL);